Design strategy to improve the transmission efficiency in visible spectrum

Metasurfaces are opening up promising flexibilities to reshape the wavefront of electromagnetic waves, and a notable optical phenomenon is observed with the tailored surface plasmon. However, meta-devices with metallic material face challenges of low transmission efficiency, especially in the visible spectrum. In this work, a multilayer metamaterial strategy is proposed to improve the transmission. By adding dielectric material as space layer is inserted along the propagation direction, vertical cavities are formed to modulate the transmission and reflection. The multilayer structure is numerically studied to discuss the transmission efficiency. A maximum transmission efficiency of 90% is achieved by adding a spin on glass material to the silver layer at the visible spectrum. The transmission efficiency with and without space layer is discussed as a control. Significantly, the surface plasma and the phase could still be modulated by adjusting the geometrical parameters of the multilayer metamaterial for diversified functionalities.